EP0518229A1 - Rudder for watercraft - Google Patents

Rudder for watercraft Download PDF

Info

Publication number
EP0518229A1
EP0518229A1 EP92109529A EP92109529A EP0518229A1 EP 0518229 A1 EP0518229 A1 EP 0518229A1 EP 92109529 A EP92109529 A EP 92109529A EP 92109529 A EP92109529 A EP 92109529A EP 0518229 A1 EP0518229 A1 EP 0518229A1
Authority
EP
European Patent Office
Prior art keywords
blade
rudder according
blades
rudder
plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92109529A
Other languages
German (de)
English (en)
French (fr)
Inventor
Giorgio Brighi
Franco Harrauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0518229A1 publication Critical patent/EP0518229A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/44—Steering or slowing-down by extensible flaps or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B39/061—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water by using trimflaps, i.e. flaps mounted on the rear of a boat, e.g. speed boat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B2039/065—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water the foils being pivotal about an axis substantially parallel to the longitudinal axis of the vessel

Definitions

  • the invention relates to a rudder for watercraft.
  • rudders consist of one or more vertical blades which are immersed constantly in their operative position and are supported below the hull so as to be rotatable about a vertical axis. Under way, the action of rudders is limited to very short time periods, i.e. only during either turns or course adjustments. In contrast, however, conventional rudders permanently contribute substantially (about 6% to 10%) to the total hydrodynamic drag of hulls. Moreover, hydrodynamic drag, known also as protrusions drag, increases with the squared speed during the movement. With the use of surface screw propellers, rudders constitute presently also the terminal hydrodynamic drag affecting a hull.
  • the object of the invention is to provide a rudder for watercraft, which is adapted to overcome effectively and with a comparatively small constructional disbursement the disadvantages of known rudders.
  • the invention aims to provide watercraft rudders which can be easily and quickly mounted either on newly-built or on existing watercraft.
  • the invention achieves these objects by providing a watercraft rudder comprising two rudder blades having opposite hydrofoil configurations and arranged in the aft region of the hull, apaced apart transversely thereto and symmetrically with respect to the centerline of the craft, and movable in both senses in the vertical direction, alternately from a contemporary raised unoperative position to an immersed operative position, wherein the respectively immersed blade causes the turn or shift of course of the watercraft to the corresponding direction, and vice versa, this effect being due to the action of the hydrofoil and to the incidence of the latter, which changes with the twist of the blades.
  • the blades are completely raised out of the water, or else they can penetrate the water either partially or completely.
  • the blades can be immersed gradually to different levels of their height and their hydrofoil can have a variable action at the different cross sections, for example a helical configuration which tapers towards the free end thereof, whereby the steering effect on the craft varies depending upon the depth of their immersion.
  • the blades may be provided with anti-cavitation means capable of preventing or anyway minimizing said effects.
  • the control means for the rudder may be of conventional type, comprising a steering wheel or tiller whose progressive rotation in either directions causes, through a suitable drive of mechanical, pneumatic, hydraulic or the like type and/or of manual or servo-assisted type, the progressive raising and lowering of either the one or the other blade.
  • the rudder blades may be kept in a raised unoperative position, completely out of the water, until a turn or shift of course is desired.
  • the helmsman commands the immersion of only one of the two blades and keeps it in the operative immersed position only during the time period that is required to effect said turn.
  • the hydrodynamic interference between blades and water therefore, is limited only to the operative periods of the rudder, thus eliminating effectively its dragging contribution to the drag due to the hull.
  • the reduction of drag may be up to 6% to 7% of the total drag of the hull, thus permitting either to obtain an increase of speed or to use propelling engines of correspondingly lower power.
  • the invention also relates to other characteristics which further improve the invention rudder and which constitute the subject matter of the sub-claims.
  • a first embodiment of the rudder comprises an arm 1 which is bent intermediately into a V configuration and is provided at the free ends thereof with a respective rudder blade 3 directed transversely to the extent of the V-shaped arm 1 and longitudinally to the hull.
  • the V-shaped arm 1 is secured to a rotatable shaft 2 at the apex of the V.
  • the rotatable shaft 2 is journaled in the intermediate region of the transom or stern plate 4 of a watercraft having a V-shaped careen.
  • the level of the journal for the shaft 2 in the transom 4, the angle of the V-shaped arm 1, and the angle between the rudder blades 3 and respective section of the arm 1 are so dimensioned whereby, in the unoperative position of the rudder (i.e. with the arm 1 in the horizontal position), both blades do not project beyond the lower surface of the careen 5, whereas in the operative position when the rudder fulfils its maximum shifting action (as shown with dot-and-dash lines in Figure 1), the arm 1 is so inclined whereby the respective immersed blade 3 protrudes entirely beyond the lower surface of the careen 5 and is orientated in a substantially vertical position.
  • the oscillation of the arm 1 in either directions may be controlled by means of the usual steering wheel or tiller through any drive means, for example, of the mechanical, electrical, hydraulic or pneumatic type, etc.
  • the rotatable shaft 2 on the inner side of the transom 4, carries, in a mutually non-rotatable manner, a control lever 6 which is pivoted at 7 to the rod 8 of a double-acting actuating cylinder 9 of the pneumatic or hydraulic type, or the like.
  • the cylinder 9 may be controlled by means of a simple hydraulic circuit which is closed by an additional actuating cylinder (not shown) which is connected to the steering wheel or tiller.
  • Each blade 3 comprises, on its outer side 103, a variable-action hydrofoil.
  • the hydrofoil is of helical configuration and is tapered transversely to the blades 3 transversely thereof.
  • the extrados or suction side 203 is substantially planar and the blade 3 merges with the V-shaped arm 1 through the intermediary of a perpendicular plate 303 which is orientated longitudinally of the hull and which, in the fully immersed position of the rudder, is substantially horizontal.
  • the blades 3 are tapered towards their free end with a rounded or helical profile also longitudinally of the hull.
  • the rudder is kept in the raised unoperative position according to Figure 1.
  • the blades 3 do not interfere with the water flowing under the careen 5, thus avoiding contributing to the hydrodynamic drag.
  • the helmsman causes a corresponding oscillation of the arm 1 in the same direction and, therefore, the immersion of a given length of the respective blade 3 into the water flowing under the careen 5. Since the shifting effect of the blade 3 is determined by the action of the helical configuration thereof which has been immersed, said shifting effect can be proportioned continuously depending upon the extent a blade 3 has been immersed into the water flowing under the careen 5. Increasing steering angles, therefore, will cause increasing immersion extents of the respective blade 3 into the water flowing under the careen 5 and, as a result, a stronger shifting action, i.e. a narrower and more abrupt turn.
  • each blade 3 is actuated independently by an associated hydraulic double-acting cylinder 10.
  • the blades 3 are shown diagrammatically, but the raising and lowering movements of the blades may be carried out as shown in the example of Figures 5 to 7.
  • the double-acting cylinders 10 are connected to each other and to an actuating pump so as to constitute a closed hydraulic circuit.
  • the steering wheel (not shown) controls a reversible manual pump 12 which is connected separately via the control ducts 13,13' to the upper chamber 110 of each of the two actuating cylinders 10.
  • the lower chambers 210 of the two cylinders 10 are connected to each other via a duct 14.
  • a liquid tank 15 maintains the fluid head and is connected separately to the control ducts 13,13' via the ducts 16,16' having inserted therein the filling valves 17,17'.
  • a conventional double stop valve 18 is inserted in the control circuits.
  • both pistons 19 in the cylinders 10 are in such an intermediate position whereby the free ends of the associated blades 3 skim the surface of the water.
  • the flow of pressurized liquid causes the piston 19 of one of the actuating cylinders 10 to move downwards, and the piston 19 of the other actuating cylinders 10 to move simultaneously upwards, whereby one of the respectively associated blades 3 will be immersed and the other will be raised according to the selected steering angle.
  • a powered pumping unit 30 may be provided in addition to the manual pump 12 or as an alternative thereto.
  • the example of Figure 3 is referred to small-sized watercraft wherein manual steering by means of the pump 12 is convenient.
  • a control system according to the example of Figure 4 may be used.
  • the pumping unit 30 is connected to the remaining part of the circuit by means of a hydro-guide 32 of conventional type, for example of the type which is used also on motor-vehicles.
  • the two pipes 36,36' connecting the hydro-guide 32 to the slave cylinder to move it in either direction, in accordance with the actuation of the steering wheel 33, are connected contemporarily to both cylinders 10.
  • the right-hand pipe 36' is connected both to the lower chamber 210 of the left-hand cylinder and to the upper chamber 110 of the right-hand cylinder 10 and, vice versa, the pipe 36 is connected to the upper chamber 110 of the left-hand cylinder 10 and to the lower chamber 210 of the right-hand cylinder 10.
  • Such a circuit causes simultaneously the actuation of a cylinder 10 in one direction and of the other cylinder 10 in the opposite direction, for example, the right-hand cylinder 10 "upwards” and the left-hand cylinder 10 “downwards”, and vice versa.
  • the essential characteristic of this circuit resides in the fact that the pressurized fluid always enters directly, unobstructed, the lower chamber 210 of the opposite cylinder, whereas the entrance into the upper chamber 110 of the respective hand cylinder is permitted only upon the opening of an interposed sequence-valve 38,38', calibrated at an intermediate value between zero pressure and maximum pressure, generally 10-20 bar.
  • Figures 5 to 7 show a particular embodiment of the rudder according to the invention.
  • each blade 3 is supported in a mechanically independent manner, and the connection therebetween is implemented through the control circuit.
  • Each blade 3 is secured to the underside of a horizontal supporting plate 21 which is hinged to the lower end of a plate 22 which is fixed to the transom or stern plate 4, so as to be oscillatable about a horizontal axis which is parallel to said transom plate 4.
  • the underside of the supporting plate 21 is planar, while the upper side is provided with a plurality of stiffening ribs 221.
  • the two plates 21 and 22 are connected to each other by a double-acting actuating cylinder 10.
  • the cylinder 10 is pivoted, preferably, at an end of its body portion, to the top end of the attachment plate 22, and at the end of the rod 11 to a connection lug 121 which is suitably arranged on the plate 21, specifically on its intermediate region.
  • the blades 3 will be immersed to their operative position below the lower surface of the careen 5 and will be raised to their unoperative position above said surface thanks to the oscillation of the supporting plates 21.
  • the positioning of the attachment plates 22 on the transom plate 4, the angle of oscillation thereof and of the blades are such as to ensure the operation of the rudder as described with reference to the preceding embodiments, with particular reference to that according to Figure 4.
  • the blades 3 In the transverse direction, the blades 3 have a helical hydrofoil configuration similarly to the preceding embodiments, while they are suitably curved towards the transom or stern plate, so as to compensate for their angular offset with respect to the horizontal plane which otherwise would occur upon oscillating the supporting plate 21.
  • the rudder according to the invention may be easily arranged both on newly-built watercraft and on existing watercraft, the last-described embodiment is particularly advantageous in that it does not require any direct operation on the hull, and particularly no through-hole below the waterline. All supporting means and actuators are external to the transom or stern plate. Only the control ducts for the actuating cylinders and the other elements of the control circuit are to be arranged within the hull.
  • each blade 3 may be associated with means for preventing or limiting the cavitation effects.
  • Said means may consist of a stationary flap which is formed by a horizontal rearwards extension of the attachment plate 22, terminating at a certain distance from the front side of the blade 3.
  • FIGS 6 and 7 show a particular exemplary embodiment wherein the immersion rudder 3 is associated with a trimming flap 23, which is very advantageous in limiting the likelihood of cavitation at said rudder.
  • An attachment plate 22 is secured to the hull and supports a horizontal planar portion 122, which is suitably ribbed, comprising a hinge 221' for pivotal movement of both the supporting plate 21 for the operative rudder blade 3 through an angle of about 45°-55°, and the ribbed flap 23 through a limited angle of about 12°-15°. Substantially, the blade 3 enters the water by passing through a triangular slot 25 in the flap 23.
  • the up-and-down actuation of the rudder 3 secured to its supporting plate 21 is effected by means of the cylinder 10, while the up-and-down actuation of the flap 23 is effected by means of a pair of parallel cylinders 24.
  • the actuating cylinder 10 for oscillating the blades 3 is embedded within the transom or stern plate 5'.
  • the stern plate 5' comprises a slot 105' which accommodates a recess-like housing 40 of the attachment plate 22.
  • the actuating cylinder is supported, so as to be pivotable in a vertical longitudinal plane, at its end within the recess-like housing 40, and only its rod 11 protrudes therefrom in a rearwards direction.
  • the attachment plate 22 has also fixed thereon a casing 41 in the shape of a cylinder sector which is co-axial with the pivotal axis 221' of the supporting plate 21 of the blade 3 and which has a radial section complementary to, and slightly larger than, the planform of said supporting plate 21, and which extends angularly substantially from the attachment plate 22 to the completely-lowered supporting plate 21.
  • the rearwards extension of the rudder can be reduced, in that the pivotal connection of the rod 11 to the supporting plate 21 will be nearer to said stern-plate 5'.
  • the actuating cylinder 10 is supported pivotably at least in said longitudinal vertical plane in the region of the stern-plate 5' thanks to an articulated joint 42 arranged at the outlet end thereof for the rod 11, directed towards said stern-plate.
  • the articulated joint 42 is of the spherical type and is located, preferably, at the free end of an axial tubular extension 43 of said end of the actuating cylinder 10, permitting the outlet of the rod 11 which is guided through the tubular extension 43.
  • the spherical joint 42 is engaged in a complementary spherical seat formed in a supporting bush 44 secured to the stern plate 5' at a through-slot 105'.
  • the annular seat comprises two rings 45,46 which are tightened against each other around the joint 42 within the bush 44 thanks to a locking ring 47 which can be threaded in the bush 44.
  • the watertight condition through the bush 44 is ensured by seals 48,49 mounted on the rings 45,46 and interposed between the rings 45 and/or 46 and the surface of the spherical joint 42 and between them and the inner wall of the bush 44, respectively.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Fluid-Pressure Circuits (AREA)
EP92109529A 1991-06-14 1992-06-05 Rudder for watercraft Withdrawn EP0518229A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITGE910084 1991-06-14
ITGE910084A IT1249231B (it) 1991-06-14 1991-06-14 Timone per imbarcazioni

Publications (1)

Publication Number Publication Date
EP0518229A1 true EP0518229A1 (en) 1992-12-16

Family

ID=11354094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92109529A Withdrawn EP0518229A1 (en) 1991-06-14 1992-06-05 Rudder for watercraft

Country Status (2)

Country Link
EP (1) EP0518229A1 (it)
IT (1) IT1249231B (it)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080190A1 (en) 2004-02-24 2005-09-01 Giorgio Brighi Steering and/or stabilising device for motorised watercraft
WO2008095323A1 (de) * 2007-02-05 2008-08-14 Mueller Peter A Mehrzweckklappe für wasserfahrzeuge
FR2933372A1 (fr) * 2008-07-07 2010-01-08 Aker Yards Sa Navire dont la poupe est equipee d'un tel dispositif de deflection de flux d'eau
US20110126751A1 (en) * 2007-12-31 2011-06-02 Mueller Peter A Variable overall hull lengths for watercraft
WO2011142870A3 (en) * 2010-02-18 2012-07-05 Morvillo Robert A Variable trim deflector system and method for controlling a marine vessel
ITGE20110053A1 (it) * 2011-05-12 2012-11-13 Giorgio Brighi Apparati di governo e di stabilizzazione antirollio a pale retrattili.
US9233740B2 (en) 2013-02-08 2016-01-12 Robert A. Morvillo Variable trim deflector system with protruding foil and method for controlling a marine vessel
CN112027016A (zh) * 2020-08-24 2020-12-04 西北工业大学 一种内嵌式水洞试验用舵角控制装置
CN114408125A (zh) * 2021-12-31 2022-04-29 中国矿业大学 一种快速攀登与倾翻也能正常使用的橡皮艇

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507790A (en) * 1946-04-30 1950-05-16 Eldon W Kern Auxiliary rudder assembly for vessels
US3082727A (en) * 1960-05-25 1963-03-26 Robert L Rhoads Control system for water craft
FR1365434A (fr) * 1963-05-21 1964-07-03 Chantiers Navals Franco Belges Perfectionnement apportés aux ensembles de gouvernails avant pour véhicules aquatiques
US3200782A (en) * 1964-11-06 1965-08-17 Samuel L Walden Power boat attachment
US3371642A (en) * 1965-10-15 1968-03-05 William M. Joy Trim control device for boats
DE1290052B (de) * 1964-02-15 1969-02-27 Graig Waldemar A Vorrichtung zum Steuern eines Wasserfahrzeuges mit aero- oder hydrodynamischem Auftrieb
US3603277A (en) * 1969-06-11 1971-09-07 Leslie R Manary Speed control for boats
US3982493A (en) * 1975-06-26 1976-09-28 Cronin Charles W Skid control mechanism for boats
FR2556312A1 (fr) * 1983-12-13 1985-06-14 Charente Maritime Assoc Voilie Gouvernail alternatif a deux pales a position angulaire pouvant etre fixe ou ajustable et a action par immersion plus ou moins importante de l'une ou l'autre pour obtenir l'action choisie

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507790A (en) * 1946-04-30 1950-05-16 Eldon W Kern Auxiliary rudder assembly for vessels
US3082727A (en) * 1960-05-25 1963-03-26 Robert L Rhoads Control system for water craft
FR1365434A (fr) * 1963-05-21 1964-07-03 Chantiers Navals Franco Belges Perfectionnement apportés aux ensembles de gouvernails avant pour véhicules aquatiques
DE1290052B (de) * 1964-02-15 1969-02-27 Graig Waldemar A Vorrichtung zum Steuern eines Wasserfahrzeuges mit aero- oder hydrodynamischem Auftrieb
US3200782A (en) * 1964-11-06 1965-08-17 Samuel L Walden Power boat attachment
US3371642A (en) * 1965-10-15 1968-03-05 William M. Joy Trim control device for boats
US3603277A (en) * 1969-06-11 1971-09-07 Leslie R Manary Speed control for boats
US3982493A (en) * 1975-06-26 1976-09-28 Cronin Charles W Skid control mechanism for boats
FR2556312A1 (fr) * 1983-12-13 1985-06-14 Charente Maritime Assoc Voilie Gouvernail alternatif a deux pales a position angulaire pouvant etre fixe ou ajustable et a action par immersion plus ou moins importante de l'une ou l'autre pour obtenir l'action choisie

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005080190A1 (en) 2004-02-24 2005-09-01 Giorgio Brighi Steering and/or stabilising device for motorised watercraft
WO2008095323A1 (de) * 2007-02-05 2008-08-14 Mueller Peter A Mehrzweckklappe für wasserfahrzeuge
US20110126751A1 (en) * 2007-12-31 2011-06-02 Mueller Peter A Variable overall hull lengths for watercraft
FR2933372A1 (fr) * 2008-07-07 2010-01-08 Aker Yards Sa Navire dont la poupe est equipee d'un tel dispositif de deflection de flux d'eau
US8096255B2 (en) 2008-07-07 2012-01-17 Stx France Cruise Sa Ship with stern equipped with a device for deflecting a flow of water
US8631753B2 (en) 2010-02-18 2014-01-21 Robert A. Morvillo Variable trim deflector system and method for controlling a marine vessel
WO2011142870A3 (en) * 2010-02-18 2012-07-05 Morvillo Robert A Variable trim deflector system and method for controlling a marine vessel
US9481441B2 (en) 2010-02-18 2016-11-01 Robert A. Morvillo Variable trim deflector system and method for controlling a marine vessel
ITGE20110053A1 (it) * 2011-05-12 2012-11-13 Giorgio Brighi Apparati di governo e di stabilizzazione antirollio a pale retrattili.
WO2012152864A1 (en) 2011-05-12 2012-11-15 Giorgio Brighi Steering and roll-stabilizing device with retractable fins
US9233740B2 (en) 2013-02-08 2016-01-12 Robert A. Morvillo Variable trim deflector system with protruding foil and method for controlling a marine vessel
CN112027016A (zh) * 2020-08-24 2020-12-04 西北工业大学 一种内嵌式水洞试验用舵角控制装置
CN114408125A (zh) * 2021-12-31 2022-04-29 中国矿业大学 一种快速攀登与倾翻也能正常使用的橡皮艇
CN114408125B (zh) * 2021-12-31 2024-05-24 中国矿业大学 一种快速攀登与倾翻也能正常使用的橡皮艇

Also Published As

Publication number Publication date
ITGE910084A1 (it) 1992-12-14
IT1249231B (it) 1995-02-21
ITGE910084A0 (it) 1991-06-14

Similar Documents

Publication Publication Date Title
US4977845A (en) Boat propulsion and handling system
US7434527B2 (en) Steering and/or stabilising device for motorized watercraft
US4645463A (en) Marine outdrive apparatus
CN101484353B (zh) 具有船首控制表面的船
AU2002211455B2 (en) Boat propulsion system
US3915111A (en) Hydraulic marine propulsion and guidance system
US3901177A (en) Marine propulsion apparatus
US5280760A (en) Sailing craft
US3468282A (en) Continuous operation motor tilt control mechanism
JPS6127237B2 (it)
US5445100A (en) Dual rudder system for trimming planing-type hulls
US6234854B1 (en) Marine drive assembly
EP0518229A1 (en) Rudder for watercraft
AU2002211455A1 (en) Boat propulsion system
US5301624A (en) Stern planes for swath vessel
US4552083A (en) High-speed semisubmerged ship maneuvering system
WO1997046445A1 (en) Marine propulsion and steering unit
NO336387B1 (no) Sjøgående skip, drevet med minst to rorpropeller, omfattende et skrog med en særlig utformet strømningskanal.
US2708894A (en) Hydrofoil craft having forwardly extending water engaging and hydrofoil moving means
US4827862A (en) Aerodynamic control system for high speed motorboats
US5988097A (en) Watercraft stabilized by controlled hydrofoil elevation
GB2490597A (en) Boat steering arrangement incorporating a control surface assembly with trim tab and steerable skeg
CN112278223A (zh) 襟翼舵***
US3520265A (en) Control means for stabilizing watercraft
US5313906A (en) Small waterplane twin hull vessel

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19930617